In Third Age 1856, Rhovanion was invaded by a tribe of Easterlings known as the Wainriders.
The soldiers of the Kingdom of Rhovanion, together with the armies of Gondor, met the Wainriders at the Battle of the Plains, which was a disaster. The King of Gondor, Narmacil II, was killed and Marhwini's father Marhari died leading the rearguard. Much of the Kingdom of Rhovanion was lost and its people were enslaved. Some Northmen escaped, and Marhwini led one band of refugees to the west.